Display device and method for operating such a display device

ABSTRACT

The present invention relates to a display device comprising at least one display unit and an illumination device for illuminating an edge region of the at least one display unit. The invention further relates to a method for operating such a display device and to an entertainment device comprising such a display device. The display device according to the invention comprises, in addition to the at least one display unit and the illumination device, at least one determination means for determining a color information from an image block of the at least one display unit, and further comprises a color control means for controlling the color and/or color spectrum of the light emitted by the illumination device as a function of the color information. The color information can be obtained from the light which is actually emitted by the display unit in said image block, for which a light detection device having an observation region that is limited to the image block can be provided.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Application No. PCT/EP2015/002271, filed Nov. 11, 2015, which claims priority to German Utility Model Application No. 20 2014 008 340.1, filed Oct. 20, 2014, and German Patent Application No. 10 2014 016 643.0, filed Nov. 11, 2014, all of which are incorporated by reference herein in their entireties.

BACKGROUND

1) Technical Field

The present invention relates to a display device comprising at least one display unit as well as an illuminating device particularly for illuminating the surroundings of an edge area of the at least one display unit. The invention further relates to a method for operating such a display device as well as an entertainment machine comprising such a display device.

2) Description of the Related Art

In the case of entertainment machines, such as, for example, gaming devices, gambling terminals and other entertainment devices or also in the case of large-surface display devices, such as public viewing displays or conference room displays, it is sometimes advantageous, to use a plurality of separately embodied display units, which are arranged next to one another or on top of one another, instead of using a single, large-area display unit. By means of display units, which on principle have standard formats, it is also possible through this to create display devices of other formats, without having to use expensive custom products for this purpose. On the other hand, a plurality of separate, independently operable display units can also be advantageous, for example in the case of entertainment machines, so as to be able to display different image contents without extensive split screen control of an individual screen, for example so as to be able to present a game content on one display unit and additional information, such as stakes, rules and the like or also a second game content—for example an additional game—on another display unit.

The display units themselves can hereby in each case form assemblies, which are independent per se, which form display assemblies, which can be mounted or exchanged independently from one another, respectively, and/or which have power supply units, which are embodied independently from one another, and/or control systems, which are embodied independently from one another, which control the display elements, which are generated on the respective display unit. In the context of the application at hand, a display unit can in particular be a screen, wherein a screen, which forms a display unit, can be embodied so as to be flat in terms of a common flat screen or curved in terms of an electronic screen, which simulates reels, for example.

In the context of the invention at hand, separate display units are thus in particular independently functioning display assemblies, which have display surfaces, which are visible or perceivable, respectively, independently from one another and which in each case have an independent spatially-physically defined shape, which can for example be delimited by means of a frame or a housing. The display fields of the separate display units may be arranged next to one another so as to be offset at right angles to the viewing direction and/or on top of one another and, if applicable, also at a distance from one another, wherein the display fields or display field or image sections, respectively, of the separate display units, which are visible from the observation point or device operating position, are preferably located outside of one another, in particular in such a way that a display field, which is visible from the device operating position or image section of a display unit, respectively, is located outside of the display field or image section, respectively, of the respective other display unit.

In the case of such separate display units, however, the illustrated image contents or the display surfaces, respectively, can often not be placed edge-to-edge without a gap, but a gap-shaped space remains between the displayable image contents or the display surfaces, respectively, so that the division into separate display units remains clearly visible to the observer and that a harmonious transition between the image contents, which is more pleasant for the visual perception, is not present between the image contents, which may also lead to symptoms of fatigue for the observer and for his eyes. Such a gap between the separate display units substantially results from the fact that the separate display units often have frames, which surround the actual display surface, on which image contents can be displayed, all around, so that the display surface does not reach all the way to the circumferential delimitation of the display unit. Due to the fact that the display units also have separate housings, the space required for the housing walls also results in a certain spacing of the display units or the display surfaces thereof, respectively.

In the case of gaming machines, it has already been proposed to arrange the display units so as to be staggered one behind the other, see, for example, WO 2009/033615, whereby the edge or border area, respectively, of the rear screen is covered and is no longer visible. However, the border area of the front screens remains as sight barrier or spacing, respectively, between the display surfaces.

In the case of television sets, it has already been proposed to make the actual display surface appear to be bigger, in that light sources are arranged on the borders of the screen, which radiate onto a wall located behind the screen and which illuminate this wall in color, so that the screen obtains a light enclosure in the manner of a halo. This circumferential illumination, which at times is identified as “ambient light”, is in particular effective in the case of a wall mounting of flat screens, because the light sources can be hidden behind the screen borders, so that the observer cannot look directly into the light sources. To intensify the visual enlarging effect of such an illumination, the light color of the light emitted onto the wall is thereby adapted to the screen display, i.e. the predominant color in the border areas of the display surface of the screen, see WO 2008/142639 A1 and EP 1379082 B1. It is furthermore known from EP 1994801 to hereby not only consider the colors of predetermined image blocks, which are displayed on the display surface, but to also evaluate or weight them, respectively, differently, in order to be able to more strongly adapt the color of the ambient lighting to more important image blocks. From the image signals, by means of which the screen is controlled, moving objects are identified for this purpose in the screen display, in order to be able to consider the color thereof differently for the ambient lighting.

Due to the fact that not only one color is routinely displayed in a certain image block of a screen, an average color can be formed from the plurality of the displayed colors or a color spectrum, which characterizes the image block, can be determined, as is shown, for example, in DE 10 2007 004 834 A1. The light spectra emitted by individual light sources of pixels, respectively, are thereby captured and are tuned individually in such a way that a resulting overall spectrum at least approximately, corresponds to a desired light spectrum and thus to a desired color.

It is further known from WO 2007/113754 to illuminate the environment of a screen not only in a diffusely colored manner, but to thereby generate light patterns, which are adapted to the screen display.

The present invention is based on the object of creating an improved display device, an improved entertainment machine comprising such a display device, as well as an improved method of the above-mentioned type, which avoid disadvantages of the prior art, and to further develop the latter in an advantageous manner. In particular, a harmonious, visual transition, which is as smooth as possible, it to be obtained between the display unit and the supplementary border or ambient illumination, without having to interfere with the complex control of the display unit and a simple retrofitting of the supplementary ambient lighting is to be made possible.

SUMMARY OF THE INVENTION

According to the invention, the mentioned object is solved by means of a display device according to claim 1. Preferred embodiments of the invention are the subject matter of the dependent claims.

It is thus proposed to analyze the display surface of the at least one display unit, in particular the border areas of the display surface bordering the border of the display unit, with respect to the colors displayed there and to obtain color information therefrom. By means of this color information, the color of the emitted light of the illuminating device, by means of which the transition area between the at least one display unit and the surrounding area thereof is illuminated, is controlled. By considering the display surface, in particular the border areas, of the at least one or of all display units and of the image colors displayed there, the transition area between the display unit and surrounding area can be illuminated in color harmony with the respective bordering display surface. In addition to the at least one display unit and the illuminating device, the display device according to the invention comprises at least one determining device for determining a color information from an image block of the at least one display unit, and further a color control device for controlling the color and/or the color spectrum of the light emitted by the illuminating device as a function of the color information.

Such an image block of the display unit can in particular be a partial area of the display surface of the respective display unit, which is defined with regard to the contour, preferably in the vicinity of the border of the display unit, which extends adjacent to a further bordering screen. An image block can preferably be an at least approximately rectangular area of the respective display unit in the vicinity of or bordering the outer border of the respective display unit, in which area an image and/or video signal can be displayed—in particular in pixel blocks or points. In the simplest case, such an image block can encompass the entire display surface of the respective display unit. However, such an image block can also be significantly smaller than the display area of the display unit, for example less than 50% or even less than 25% of the display area of the display unit.

The color control device automatically controls the illuminating device as a function of color information from the at least one display unit. A harmonious, smooth transition between the at one display unit and the surrounding area can be reached through this, which optically mitigates the delimitation of the display unit to the surrounding area or which approximately eliminates the optical separation, respectively, so that the eye of an observer can wander back and forth between the display surface of the display unit and the surrounding area less erratically and thus in a more fatigue-free manner. The color information from the at least one display unit is determined by at least one determining device. The at least one determining device and the color control device can be combined, for example functionally and/or physically, to form a control unit or control device. The at least one determining device and the color control device, however, can also be embodied as separate units.

In advantageous further development of the invention, the color information, which characterizes the image block of the at least one display unit, can be obtained from the light emitted by the display unit in particular in the mentioned image block. For this purpose, the display device may have a light catcher or a light detection device, respectively, which catches or detects, respectively, light emitted by the display unit and guides it to the determining device, so that the determining device can obtain the mentioned color information. By determining the mentioned color information from the actually emitted light, the typically complex control of the screens does not need to be interfered with and control signals, which generate or control, respectively, the image display on the display unit, do not need to be tapped, so that a retrofitting of the additional illuminating device and the control thereof is made possible in a simple manner. In addition, deviations between the control signals and the actually emitted light color, which can be created for example as a result of wear of the illuminants of the display unit, can be reduced, because the color information is obtained directly from the actual signal or the actual state, respectively, of the emitted display light.

Such a light catcher can advantageously have a hunted observation or capturing area, respectively, in order to systematically catch the light emitted by an image block of interest of the display device or the light spectrum thereof, respectively. Said observation area can in this case in particular be smaller than the entire display area of the display unit so that only light from a partial area of the display area, in particular an edge section of the display area, is captured. For example, the observation area can be limited to the image block of interest, that is to say smaller than or equal to this picture block. Advantageously, the light catcher or the light detection device, respectively, can be directed with the mentioned limited capture area to the image block of interest of the display unit, advantageously from a border area of the display unit, in which border area the illuminating device is arranged as well. The light detection device can in particular observe or detect, respectively, the image block of the display unit obliquely glancing at an acute angle from the border of the display unit, so that light emitted from the image block is caught at an incline to the border area, in which the illuminating device is arranged.

The limited observation or capture area, respectively, of the light detection device can particular at least approximately be congruent to the image block of interest.

The light detection device can have a suitable optical system, for example in the form of a lens and/or of a reflector, so as to be able to capture the light emitted by the image block in the desired manner and to be able to transfer it to the determining device. However, such a lens or such a reflector can also be forgone, whereby the light, which is to be captured, which comes from the image block, can be coupled directly into a light guide, which can have an end section, which observes an image block and which is preferably arranged on the border of the display unit. For example, such a light guide can have a polished end surface, in order to only absorb light beams at a limited angle and to thereby keep light losses low. In the alternative, however, an optical element may also be connected to the light guide end or can cooperate therewith, for example a lens, which observes the image block, can be connected to the optical waveguide by means of a coupling gel.

Light or light spectrum, respectively, emitted by the respective image block can be coupled into this optical waveguide and can be transmitted to the determining device with as little scatter loss as possible. The transferred light or light spectrum, respectively, can then be converted accordingly into a color information, for example, in the determining device, and can then be evaluated accordingly. A respective color information of the respective image block for example can thus be determined systematically—ideally by influencing other, e.g. adjacent image blocks, as little as possible.

Advantageously, the mentioned optical waveguide can comprise a bundle of optical fibers, whereby these optical fibers can preferably be connected to one another and/or fastened to one another and/or bundled, for example adhered. An end section of the optical waveguide can thereby face the image block, in order to catch light emitted from it, while the other end of the optical waveguide can be connected to the determining device. In order to keep light losses low, the bending radii of the optical waveguide between the two mentioned ends can be chosen so as to be sufficiently large as a function of the used materials and diameters of the optical fibers.

In advantageous further development of the invention, the mentioned light detection device, which captures light emitted from an image block of the display unit, can be integrated in the supplementary illuminating device, which is arranged on the border of the display unit, or can be combined with this illuminating device, respectively, to form a pre-mounted assembly, so that the illuminating device, together with the light detection device, can be mounted to the display unit in a simple manner as pre-mounted assembly. In particular, the mentioned optical waveguide can be combined with an emission optics, which emission optics radiates the light emitted by the at least one light source of the illuminating device, in the desired manner. If the mentioned emission optics comprises a lens-like optical element of plastic or glass, for example, the optical waveguide can run through the body of this optical element at least in sections, in particular be cast into the material of the optical element. The mentioned optical element can hereby not only be embodied as lens, but can for example also comprise a diffusing lens and/or a light condenser, for example in Fresnell design. In the alternative or in addition, the emission optics can also comprise a reflector, which can be assigned to one or a plurality of light sources of the supplementary, border-side illuminating device.

The modules can advantageously have connecting means at their end sections, so that modules can be arranged one behind the other and/or side by side, the connecting means being able to be provided with contacts at least for the power supply and/or for drive signals. The connecting means can be such that a module can be added at an angle of preferably 90° and thus a framing of the display is possible, in particular a frame can be designed in a plane parallel to the display surface of interconnected modules. If desired, special module corner pieces can also be used at the corners, which have connecting and/or contact means on adjacent surfaces, to which in each case a series of other modules may be connected.

The mentioned emission optics can in particular be designed in such a way that a preferably expanding beam is emitted in a focused manner, the main emission direction of which is preferably focused onto an operating location in front of the display unit. Depending on the embodiment of the emission optics, the beam can hereby be an expanding radiating cone, or can be a light wedge, which widens in an approximately v-shaped manner, in the case of a strip-shaped arrangement of a plurality of light sources in the case of an arrangement or an elongated light source. The widening angle of such a radiating cone or wedge, respectively, can be chosen in different ways, for example in the range of between 2×45° and 2×80°.

In the alternative or in addition to the mentioned optical waveguide, the determining device and/or the color control device can also be combined with the mentioned emission optics and/or at least one light emitting element of the border-side, supplementary illuminating device to form a pre-mounted assembly, wherein the determining device and/or the color control device can in particular be arranged in the interior of the body of an optical element and/or of a supply element of the lightsource, in particular cast into the material of a lens and/or integrated into a printed circuit board, which supplies and/or controls the light source.

For controlling the illuminating device, a further image block of the same or of another display unit and/or the ambient light, which appears in a surrounding area adjacent to the display unit, can also be considered in addition to the at least one image block of the at least one display unit and the color information obtained therefrom. If for example a plurality of separate display units is used, wherein the illuminating device can be arranged in a gap between the two display units and/or can illuminate a transition area between the two display units, the determining device can determine a second color information from an image block of the second display unit in addition to the first color information from an image block of the one display unit, wherein the color control device can control the color and/or the color spectrum of the light emitted by the illuminating device as a function of the first as well as of the second color information. Irrespective of the number of the used display units, the color information of the ambient light can be considered as well. In addition to the color information from an image block of the at least one display unit, the determining device can for example obtain a color information of the ambient light, which appears in an surrounding area adjacent to the display unit, wherein the color control device can then control the color and/or the color spectrum of the additional light emitted by the illuminating device as a function of the color information from the image block and the color information from the ambient light.

For this purpose, provision can advantageously be made for an ambient light determining device, which captures ambient light, wherein this ambient light determining device can on principle be embodied analogous to the light determining device, which captures light emitted by an image block of the display unit and was described above, can in particular have a corresponding light guide and/or corresponding optical elements and/or a corresponding arrangement. The consideration of the ambient light can also take place in the case of a plurality of separate display units, in particular on the lateral borders of the display units, which do not face another display unit.

In particular, the color of the light emitted by the illuminating device can be mixed from the predominant colors of the image blocks bordering border area of display unit or from the color information obtained from the mentioned image blocks, respectively, and/or the surrounding areas. A mixed color, which can be emitted by the illuminating device, can include color portions, which correspond to the color information from the image block of the above-mentioned first display unit, and can also include color portions, which correspond to the color information from the image block of the second display unit and/or the color information from the ambient light. The above-mentioned color control device can hereby be set up to mix the first and second color information to form a color signal, wherein the illuminating device is embodied to deliver a mixed color in accordance with the color signal or mixed color signal, respectively, generated by means of mixing.

In the alternative or in addition, the color control device can also determine more than only one color signal from the color information determined from the image blocks of the different display units, and can use the different color signals to control different light emitting elements of the illuminating device, in order to physically obtain a color mixture only on the plane of the light emitted by the light emitting elements. More specifically, a first color signal can be determined from the first color information and a second color signal can be determined from the second color information, wherein a first light emitting element of the illuminating device is controlled by means of the first color signal and a second light emitting element of the illuminating device can be controlled by means of the second color signal, so that individually colored light is in each case emitted by the first light emitting element and by the second light emitting element. Depending on the color information from the respective assigned display unit, the light emitting elements thereby in particular emit differently colored light, which then mixes into a mixed color light.

In order to obtain an optically as seamless as possible transition between the at least two separate display units by means of the light emitted by the illuminating device, the illuminating device can be arranged, in an advantageous further development of the invention, at least partially in the border area of the at least one display unit and can have a main emission direction, which is directed away from the display unit onto the observer or an intended observation point, respectively, or which is emitted parallel to a main emission direction of the at least one display unit, respectively. In contrast to the known circumferential illuminations of screens, the illuminating device thus advantageously illuminates forwards into an area in front of the front side of the display units, which the display units face with their display surfaces, and in which an observer stands or sits as intended. The illuminating device thus does not have the impression of a background illumination, but forms a foreground illumination.

The illuminating device can advantageously have an emission optics for generating a beam, which widens in emission direction, which beam at least partially covers the at least one display unit, advantageously edge areas, which face one another, of the at least two adjacent display units, towards a front side of the display units. The mentioned emission optics can for example comprise one or a plurality of suitable lenses, which capture the light emitted by at least one light source and emit it in the form of a focused bundle. The mentioned at least one lens can thereby provided in addition to the primary lens, which is common in the case of LEDs and which is located directly on the LED element. As an alternative or in addition to such a lens, the optical emission system can also comprise at least one reflector, which captures the light emitted by the at least one light source, and emits it to the front side of the display units in the form of the mentioned beam. The emission optics can for example furthermore also be embodied as so-called diffusor, by means of which the light emitted by the light source is scattered.

By covering the edge areas, with the emitted light beam, the observer of the display units at least no longer predominantly sees the edge areas of the display units, but the emitted beam of the illuminating device, so that the light emitted by the illuminating device can create a harmonious transition between the display units or between a display unit and the surrounding area, respectively. The light beam thus builds a light bridge, so to speak, between the display surfaces of adjacent display units or between a display unit and the surrounding area and hereby covers the transition area between the display units or between a display unit and the surrounding area, respectively.

Alternatively or in addition to a forwardly directed main emission direction, the radiation optics and/or at least one of the light elements can also be arranged backwards, for example in the opposite direction to the radiation direction of the display unit and/or away from the display unit, for example essentially in the plane of the display unit and/or transversely to the radiation direction of the display unit.

The at least one light source of the illuminating device may hereby be arranged directly on the border of a display unit or between the display units, in particular in a gap between the spaced-apart borders or edges thereof, respectively, whereby the emission optics (e.g. lens, lens comprising light guide, diffusor, etc.) may also be arranged directly on the border of a display unit or between the display units, but may also be superimposed to the border area of a display unit. In the alternative, the light source itself can also be arranged in front of the border area of a display unit; it can in particular be located directly above a gap between the display units or can be superimposed to the transition area between the two display units.

On principle, the illuminating device can thereby comprise different types of light sources, for example a rod-shaped fluorescent tube or a narrow, elongated light strip. In the alternative or in addition, the illuminating device may also comprise a plurality of in particular punctiform light sources, preferably in the form of LEDs or RGB emitters, which may be arranged next to one another in one or several rows and/or in a matrix-like arrangement.

As a whole, the arrangement of the light sources of the illuminating device and/or the contour of the illuminating device as a whole may be adapted to the border area of a display unit, in particular to the transition area between display units, wherein a strip-shaped contouring of the illuminating device can be provided in particular in the case of an elongated, gap-shaped transition area between the display units. For this purpose, provision can be made for example for one or a plurality of rows of LEDs. The mentioned LEDs or the punctiform light sources embodied in a different way, respectively, can for example be located directly on a printed circuit board for controlling the light sources.

Advantageously, the mentioned light sources may hereby be controlled individually or in subgroups by the control device, in particular in such a way that the light intensity of the light sources can be adjusted individually or in groups, respectively. By means of such a separate controllability of the light sources, the red light proportion may be increased for example, in that the light sources, which emit red, are powered up in their power output or in their light intensity, respectively. For example the blue-light proportion can be reduced accordingly, in that the blue light-emitting light sources are dimmed or in that their light intensity is brought down, respectively.

When using a plurality of light sources, a specific color distribution can also be provided to the emitted beam with respect to its coloring, for example to the effect that the emitted beam does not evenly emit orange-colored light, when a transition between a yellowish image block on the first display unit to a reddish image block on the first or a second display unit is to be created, but the beam to the display unit, the border-side image block of which includes yellowish light, can include more yellow light and can emit more red light towards the second border-side image block, which includes more reddish light. Such a color distribution in the beam emitted by the illuminating device can be obtained for example by means of a suitable embodiment of the emission optics. Different emission directions or main emission directions, respectively, can be assigned to the different light sources, for example in such a way that an upper LED row radiates slightly upwards and a lower LED row radiates slightly downwards, in order to be able to assign a light color more to a lower display unit and to assign another light color more to an upper display unit. It goes without saying that further LED rows can also be provided hereby, which have overlapping main emission directions. In the alternative or in addition, the above-mentioned lower and upper rows—in the case of a different arrangement—or other light source groups may irradiate overlapping beam segments in spite of their different main emission directions, in order to obtain a mixing of the colors and a harmonious transition.

In further development of the invention, provision can be made for the illuminating device to be subdivided into a plurality of light emitting elements, which are lined up along the transition area of a display unit and the surrounding area or between two adjacent display units, respectively, and which can each be controlled separately. The light emitting elements can hereby in each case be assigned their own image block, if applicable together with an ambient light information or a border area of the surrounding area, or its own pair of image blocks. The first and second color information, as a function of which the respective light emitting element can be controlled by the color control device, can in each case be obtained individually from this pair of image blocks or from an image block of the surrounding area. The color or the color spectrum of a respective light emitting element is not controlled according to the average color or the color spectrum, respectively, of all of the border areas of the bordering display units, or, e.g., of the entire display surface of the display units, but only by means of the predominant color or color spectrum, respectively, of an image block pair or of an image block and surrounding area pair, which is located directly in the vicinity of the respective light emitting element. In other words, a middle-central light emitting element for example only displays or reproduces, respectively, the colors of the middle-central image blocks, while image blocks on the right and left borders next to the middle-central lighting image blocks are not considered in response to the color control of the middle-central light emitting elements or are at least weighted less strongly.

To allow for a simple mounting of the display device, the mentioned at least one display unit can form a pre-assemblable built-in module together with the illuminating device, preferably including the above-mentioned light catcher, which, as such or as pre-assemblable unit, respectively, can be installed into a common device housing or can be attached to a common wall holder or a common floor stand. In particular, two or more display units, together with the illuminating device, which is provided in the transition area between the separate display units, can also be pre-mounted to form a dimensionally stable assembly, which is then inserted into the device housing or mounted to the wall holder or floor stand, respectively.

The mentioned display units can hereby be embodied in different ways and can be positioned relative to one another in different ways. Advantageously, for example at least two display units can be inclined relative to one another at an obtuse angle, in particular in such a way that the display surfaces of the display units, which face a predetermined observer position, have an angle of less than 180° to one another.

The mentioned display units can thereby comprise display surfaces, which are embodied in a substantially flat manner. In the alternative, however, the display units may preferably also have uniaxially curved display surfaces.

In the case of a flat embodiment of the display surfaces, the display units may also be arranged parallel to one another or in a common plane, respectively. In the area of their bordering border areas, the display units can advantageously be arranged at the same distance from a predetermined observer position, i.e. approximately with the same depth in the device housing or on a holder, respectively.

The mentioned display units may thereby be embodies as screen units, in particular as flat screen, for example in the form of a TFT or LCD screen.

On principle, the open or closed-loop control of the color or of the color spectrum, respectively, of the emitted light of the illuminating device can thereby be embodied in various ways. According to an advantageous further development of the invention, the at least one determining device, which initially consecutively obtains the first color information from a first image block and temporarily stores it, if applicable, and then obtains the second color information from a second image block of the same or a further second display unit and temporarily stores it, if applicable, in turn, can be assigned to the image blocks of the display unit or a plurality of display units together. The determination of the color information from the plurality of display units may hereby be repeated cyclically so as to alternate, or, in the case of more than two display units, can take place consecutively in turn or cyclically in series, respectively, so to speak.

As an alternative to such a common determining device, which is assigned to a plurality of display units, provision can also be made for a plurality of determining devices or image blocks for determining the color information, which obtain or determine, respectively, the color information from the image blocks of the one or plurality of display units in a temporally parallel and/or temporally overlapping or also in a temporally offset manner. The color information obtained from the plurality of determining devices can hereby be supplied to the color control device in a temporally parallel and/or temporally overlapping or also in a temporally offset manner, in order to generate the color signal for controlling the illuminating device from the color information.

In particular in the color control device, the color signal for controlling the illuminating device can in particular be mixed together from the first and second and, if applicable, further color information of the image blocks of the first and, if applicable, further display units and/or the surrounding area of the at least one display unit to form the color signal or a mixed color signal, respectively. The color signal or the mixed color signal, respectively, can hereby for example be mixed together mathematically by observing at least one predetermined calculation rule. For example, color information, which is present as RGB information, can be added and averaged by color. In the case of two display units, in which an image block is analyzed in each case, for example a first red portion from the image block of the first display unit and a red light portion from the image block of the second display unit can be added together and can be divided by two, thus (R1+R2)/2, wherein the procedure is the same for the green light and blue light portions or information, respectively, thus (G1+G2)/2 and (B1+B2)/2, so that new RGB information can be determined from the averaged color parameters. The same procedure can be used when a plurality of image blocks or a surrounding area in addition to an image block is captured with respect to its light color in the case of only one display unit. In the alternative or in addition, light spectra can be captured and combined with one another, as is shown for example by DE 10 2007 004 834 A1, in order to obtain a desired resulting light spectrum.

The color signal mixed or averaged in this way, respectively, can then be used by the color control device to control the illuminating device or the light sources thereof, respectively. These light sources may then emit a corresponding light as a function of the obtained color signal.

In the alternative, the color signal for controlling the illuminating device in particular by means of the mixing functionality of the color control device may also be determined with the help of at least one color table. A matching mixed color, which is then used for the color signal or mixed color signal, respectively, to control the illuminating device, may then be deduced from the color table, for example by means of the color information of the image blocks of the first and second and, if applicable, further display units and/or of an light area of the surrounding.

In the alternative or in addition to a mixing of the determined color information of the separate display units in terms of control or mathematically, respectively, to form a mixed color signal or a deduction of the mixed color signal with the help of at least one color table, which is then used for controlling all or some light sources, the mixing of the color information may physically also first take place at the stage of the light sources or of the light emitted thereby, respectively. As a further development of the invention, the first color information determined for a first display unit may be converted and used by the color control device into a color signal or signal for triggering a first light source or a first subgroup of light sources. The mentioned color control device can convert the second color information from the second display unit or the surrounding area of the first display unit into a second color signal or color control signal, respectively, by means of which a further light source or a further subgroup of light sources is controlled. The color control device accordingly controls different light sources or different subgroups of light sources, respectively, with different color signals, which color signals in each case correspond to different color information. The mixing then takes place by mixing the light emitted by the different light sources or different subgroups of light sources, respectively.

If the color information yellow, for example, is obtained from the first display unit, a first subgroup of light sources is controlled, in order to emit yellow light. If red is determined as color information for the second display unit or the surrounding area of the first display unit, a second subgroup of light sources with a red color signal is controlled, in order to emit reddish light. The emitted yellow and the emitted reddish light then mix into orange light. By means of such a physical light mixture, computing capacity or power, respectively, may be saved and, if applicable, the above-mentioned mixing functionality in the color control device may be completely dispensed with, so that a quick conversion of an illumination, which is adapted to the image display of the different display units and/or of the surrounding area, can be obtained by means of simple control systems.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be explained in more detail below by means of preferred exemplary embodiments and corresponding drawings. In the drawings:

FIG. 1: shows a schematic top view onto a display device,

FIGS. 2a-2c show a side view of various embodiments of a display device and FIG. 2 d shows a perspective view of an embodiment of a display device.

FIGS. 3a-3e show sectional views of various embodiments of the illuminating device,

FIGS. 4a4c show various examples of a method for operating the display device.

FIG. 5: shows a schematic, partially cut side view of an entertainment machine, and

FIG. 6: shows a top view onto a display device comprising four separate display units.

DETAILED DESCRIPTION

As shown in FIG. 1, the display device 100 may comprise two separate, independent functional display units 110 and 120, which can be embodied as screens, for example in the form of flat screens, such as LCD screens or TFT screens. The two display units 110 and 120 are arranged adjacent to one another, so that the border-side edges of the display units 110 and 120 extend parallel to one another or back-to-back, respectively, and delimit a strip-shaped gap between one another.

The illuminating device 130, which, as a whole, is embodied in a strip-shaped manner or which can be adapted to the transition area between the display units 110 and 120 respectively, is arranged in this gap between the border-side edges or in the transition area between the two display units 110 and 120, respectively. In particular, the illuminating device 130 can at least partially be positioned between the border-side edges of the display units 110 and 120.

As is shown in FIG. 1, the illuminating device 130 can comprise a plurality of light emitting elements 131, 132, 133, 134, 135 and 136, which, together, form the illuminating device 130 and which can be arranged next to one another or in a row behind one another, respectively. The mentioned light emitting elements 131 to 136 can in each case comprise at least one light source, for example in the form of an LED or a RGB unit, i.e. a red-green-blue light unit. In further development of the invention however, each of the light emitting elements 131 to 136 can comprise a plurality of punctiform light sources, which can be arranged in one or in a plurality of rows in a matrix-shaped arrangement on a printed circuit board or in another suitable manner.

The display device 100, which is illustrated in an exemplary and schematic manner in FIG. 1, furthermore comprises at least one determining device 141. A first color information from an image block of the first display unit 110 as well as a second color information from an image block of the second display unit 120 can be determined with the help of the determining device 141. The display device 100 furthermore has a color control device 142, by means of which a color and/or a color spectrum of the light emitted by the illuminating device 130 or by the individual light emitting elements 131 to 136, respectively, can be scattered as a function of the first and second color information. The at least one determining device 141 and the color control device 142 can for example be functionally combined to form a control unit 140 or can be embodied as separate functional units.

As shown in FIG. 2, the display units 110, 120 can be positioned differently to one another and can even be contoured differently. As is shown in FIG. 2a , two display units 210 and 220, which are embodied so as to be flat, can be arranged at an obtuse angle to one another, so that the front sides of the display units 210 and 220, which face an observation point 201, draw an angle of less than 180° to one another. For example, an upper display unit 210 can be arranged substantially vertically, while a lower display unit 220 can be arranged at an incline to the vertical, in particular a lower border section can be tilted out forwards towards the observer spot 201. In such an obtuse-angled arrangement, the illuminating device 230 can be arranged in the area of the bending axis between the two display units 210 and 220, see FIG. 2 a.

Such an obtuse-angled arrangement of the display units can in particular be advantageous in order to integrate or install the display device 100 into a device housing 550 of an entertainment machine 500, as is shown in FIG. 5. In said FIG. 5, the two display units are identified with 510 and 520, while the illuminating device is identified with 530.

To facilitate the mounting of the display device 100, the two display units 210 and 220 or 510 and 520, respectively, can be combined together with the illuminating device 230 or 530, respectively, to form a pre-assembled built-in module 200, see FIG. 2a , which forms a dimensionally stable assembly, which can be handled as unit. The determining device 241 and the color control device 242 can furthermore be part of the mentioned pre-assembled built-in module 200—either as separate functional units (as illustrated in FIG. 2a in an exemplary manner) or combined in a control unit 240 or 540, respectively (as illustrated in FIG. 5 in an exemplary manner).

As is shown in FIG. 2b , two flat display units 210 and 220 can also be arranged in a common plane, wherein the illuminating device 230 can also be arranged in the transition area 202 between the display units 210 and 220 here. It goes without saying, however, that such a non-angled arrangement of the display units 210 and 220, together with the illuminating device 230, the determining device 241 and the color control device 242 can be combined to form a pre-mounted assembly 200, wherein the determining device 241 and the color control device 241 can also be functionally combined to form a control unit 240.

As shown in FIG. 2c or FIG. 2d , respectively, the display units 210 and 220 can also have a non-flat embodiment, in particular a curved contouring. The display units 210 and 220 can thereby in particular have a uniaxially curved display surface 250 and 260, which can be curved concavely towards the observation point 201, but which, if applicable, can also have a convex contouring. As shown in FIG. 2c and FIG. 2d , the two display units 210 and 220 can be arranged relative to one another in such a way that the curved display surfaces 250 and 260 are arranged relative to one another in such a way that the curved display surfaces 250 and 260 continue one another harmoniously or border one another in a steady, continuous manner, respectively, wherein, viewed together in section, the display surfaces 250 and 260 can have a partially circular or partially elliptical or partially oval contouring, see FIG. 2c and FIG. 2 d.

The illuminating device 230 can be provided in the transition area 202 between the two display units 210 and 220, and can be controlled by the color control device 242, wherein a combination to a pre-assembled built-in group 200 can also be provided here. For a determination of the color information, provision is made, in turn, for at least one determining device 241, which can be combined for example with the color control device 242 to form a control unit 240.

As shown in FIG. 3, the illuminating device can be provided in different ways in the transition area 202 between the display units 310, 320. As shown in FIG. 3a , at least a part of the illuminating device 330 can be arranged for example in the above-mentioned gap 334 between the border-side edges of the display units 310 and 320, wherein the mentioned border-side edges can be formed by frame parts 317 and 327 of the mentioned display units 310 and 320. The mentioned frame parts 317 and 327 can for example circumferentially enclose the screen area of the display units 310 and 320.

The light emitting element 331 shown in FIG. 3a can for example correspond to one of the light emitting elements 131 to 136 shown in FIG. 1 and can comprise one or a plurality of light sources. An emission optics 332, which captures the light emitted by the at least one light source of the light emitting element 331 and forms it into a bundle 335, can also at least partially be arranged between the display units 310 and 320, wherein the mentioned emission optics 332 can for example have a lens and/or a light guide or, e.g., can be embodied as diffusor. The beam 335 emitted by an emitting surface of the emission optics 332 advantageously has a main emission direction 336, which is directed away from the front side of the display units 310 and 320 onto the mentioned observation point 201 or which runs parallel to a main emission direction of the display units 310 and 320, respectively. The beam 335 thereby widens to the extent that, viewed from the observation point 201, the beam 335 covers the border-side edges of the display units 310 an 320, for example in the form of the frame parts 317 and 327.

As shown in FIG. 3b , the illuminating device 330 including the mentioned light emitting element 331 can also be superimposed to the transition area or the gap 334, respectively, between the display units 310 and 320, or can be arranged on the front side of the mentioned display units 310 and 320, respectively. In this case, only the connection 333 for the color control device for controlling the illuminating device 330 can substantially be guided through the transition area between the display units 310 and 320 of the rear side to the mentioned display units 310 and 320, see FIG. 3 b.

The illuminating device 330, which comprises the light emitting element 331 (e.g. LED, RGB unit, etc.), is furthermore illustrated in an exemplary manner in FIG. 3c . The illuminating device 330 is thereby at least partially arranged in the transition area or in the gap 334, respectively, between the display units 310 and 320, wherein the emission optics 332, which catches the light emitted by the at least one light source of the light emitting element 331, and forms it into a beam 335, can at least be partially arranged between the display units 310 and 320 and which is at least partially superimposed to the transition area 334 between the display units 310 and 320, respectively, or on the border-side edges, respectively, of frame parts 317 and 327 of the mentioned display units 310 and 320. As shown in FIG. 3c , the illuminating device 330 furthermore comprises at least two optical waveguides 337, one of which catches the color information output by the respective image blocks 111 to 116 and 121 to 126 of the display units 310 and 320 and is transmitted to at least one determining device 342, 343. The optical waveguides 337 are for example embodied in such a way that they can in a targeted manner transmit a color information of the respective image block 111 to 116 or 121 to 126, respectively, to which the respective optical waveguide 337 is assigned. The color information (e.g. light or light spectrum, respectively, emitted by the respective image block 111 to 116 or 121 to 126, respectively) can be converted accordingly and evaluated in the determining device 341, 343. The determined color information is then transmitted to a color control device 342, which is fed by a current/voltage supply 338, and is used for a control of the light emitting element 331—see FIG. 3 c.

On principle, however, the display device may also have only a single display unit, as is shown, for example, by FIGS. 3d and 3e , wherein the border-side arrangement of the supplementary illuminating device illustrated therein, however, can on principle also be provided in the case of a plurality of display units, in particular in the edge areas thereof, which in each case do not face another display unit.

FIG. 3e illustrates the illuminating device 330 in an exemplary manner in a top view. The illuminating device 330 is furthermore illustrated in an exemplary manner in a cross section in FIG. 3 d.

The illuminating device 330 is at least partially arranged in the border area of the display unit 310. The illuminating device 330 comprises at least one optical waveguide 337 for each of the respective image blocks 111 to 116 of the display unit 310, a respective determining device 341, a respective color control device 342 and respective light emitting elements 331 (e.g. LED, RGB unit, etc.), see FIG. 3 e.

The color information output by the respective image blocks 111 to 116 are captured by means of the respective optical waveguides 337 and are transmitted to at least one respective determining device 341. The respective optical waveguides 337, which form a light catcher or a light detection device 700, respectively, in this respect, are for example embodied in such a way that a color information of the respective image block 111 to 116, to which the respective optical waveguide 337 is assigned, can be systematically transmitted by them. In the respective determining device 341, the color information transmitted by the respective optical waveguide 337 (e.g. light or light spectrum, respectively, emitted by the respective image block 111 to 116) is converted and evaluated accordingly. The determined color information is then transferred to a respective color control device 342 and is used to control the respective light emitting element 331—see FIG. 3 e.

According to an exemplary embodiment, the respective optical waveguides 337 can consist of a bundle of optical fibers. The optical fibers are thereby preferably fastened or bundled with one another (e.g. adhered) and the end surface is polished, in order to absorb light beams only at a limited angle. To keep light losses small, corresponding bending radii are chosen as a function of the used materials and diameters of the optical fibers.

According to a preferred embodiment, the respective optical waveguides 337 can be made of one piece, for example of PMMA, and can thereby form a U-shape and deflect a light bundle for example across an angle of 90° with respect to the main emission direction of the display unit 310. Provision can furthermore be made on an end of the optical waveguide 337 for an aperture and for a photodiode sensor or an equivalent device on the other end of the optical waveguide 337. The optical waveguide 337 can have a non-uniform cross section, in order to concentrate the light onto the light emission plane.

Light beams propagate in the optical waveguide via total internal reflection. In the case of 90° angles, the light beams are reflected by means of reflective surfaces, which are metalized, for example, in order to serve as mirrors. The mirrors or reflective surfaces, respectively, can in particular be arranged on the corners of the U-shaped structure, for example as beveled surfaces at an angle of, e.g., 45°.

The structure of this optical waveguide 337 is robust and can be produced easily.

It can be mentioned that other deflection angles call be realized, for example 50°, 60°, 70°, 80°, 110°.

A reflective coating can further be used directly or indirectly (e.g. non-separable or separable) on the outer surface of the optical waveguide 337 (except for surfaces, where light is coupled in (aperture) or decoupled (light emission plane). The reflection coefficient of such a reflective coating material can be 0.9 or less. The coating is located on the surface of the optical waveguide 337 and cannot penetrate the latter.

The illuminating device 330 further comprises an emission optics 332, which captures the light emitted by the at least one light source of the light emitting element 331 and forms it into a beam 335. According to an embodiment, light emitting elements 331 could thereby be arranged as LED row on a common (rod-shaped, plate-shaped, etc.) carrier, wherein each of the individual LEDs, which are arranged in the row, has its own spherical lens as emission optics 332. Light condensers in Fresnell design can be assigned to the respective spherical lenses and a common diffusing lens can, in turn, be assigned to these condensers.

By means of the arrangement of the LED row and the condensers, a homogenous, uniform, symmetrical illumination is ensured. In the alternative or in addition, the light emitting elements 331 (LED's), which are arranged next to one another in a row, and the assigned optical waveguides 337 (which are also arranged next to one another in a row), can be cast with an optically transparent material and the optically transparent material can thereby form the emission optics 332. The illuminating device 330 can thus be embodied as a compact LED module.

As shown in FIG. 3d , the radiated beam bundle 335 can have a main radiation direction 336 which is directed away from the front side of the display units 310 and 320 to the viewing station 201 or is parallel to a main radiation direction of the display units 310 and 320. In this case, as well as in conjunction with another main radiation direction, the beam bundle 335 can expand to such an extent that, viewed from the viewing position 201, the beam bundle 335 covers the edge of the display unit on the edge side.

Alternatively, or in addition to a forwardly directed main radiation direction 336, the radiation optics 332 and/or at least one of the light elements 331 can also be arranged backwards, for example in the direction opposite to the radiation direction of the display unit, and/or away from the display unit, for example essentially in the plane of the display unit Display unit and/or transversely to the radiation direction of the display unit.

The optically transparent material can in particular be a plastic, but, e.g., also glass. The plastic is in particular a thermoplast, e.g. polycarbonate (PC), acrylnitrile-butadiene-styrene-copolymer (ABS), polymethylmethacrylate (PMMA), a cyclo-olefin copolymer (COC), polymethacrylmethylimide (PMMI) or a mixture of some or all of these substances.

The carrier or a carrier plate, respectively, can comprise electroconductive and electrically insulating layers, in particular for the power supply of the light emitting elements 331, determining devices 341 and color control devices 342.

The illuminating device 330 is at least partially arranged in the border area 317 of the display unit 310 and is at least partially superimposed by frame parts 317 of the mentioned display unit 310 on the border-side edges.

In a further embodiment, the illuminating device 330 can have at least one ambient light sensor (photodetector, photodiode), wherein a signal of the ambient light sensor can be supplied to the determining devices 341 or to the color control devices 342 and the control of the light emitting elements 331 thereby also takes place as a function of the signal of the ambient light sensor.

As is shown in FIG. 6, the display device 100 can also comprise more than two display units, for example the fourth display units 611, 612, 613 and 614 illustrated in FIG. 6, which can be positioned on top of one another and next to one another in pairs, so that the display device 100 as a whole has a rectangular contouring.

A substantially cross-shaped gap, in which illuminating devices 621, 622, 623 and 624 can be provided, in turn, in order to harmonize the transitions of the image illustrations on the display units 611 to 614, remains between the four display units 611 to 614. The mentioned illuminating devices 621 to 624 can thereby in each case be embodied in a bar-shaped or strip-shaped manner, respectively, or can be adapted to the transition area, respectively, or the gap, respectively, between the display units 611 and 614. The mentioned illuminating devices 621 to 624 can hereby also fill or cover, respectively, the central area of the cross-shaped gap, wherein two illuminating devices 622 and 624 can protrude into the central area edge-to-edge here. In the alternative, it would also be possible for all four illuminating devices 621 to 624 to fill this central area, for example by means of triangular end contours.

As shown in FIG. 6, provision can in each case be made for at least one determining device 631, 641, 651 and 661 for the illuminating devices 621 to 624 for determining the respective color information as well as for a color control device 632, 642, 652 and 662 for controlling the color of the color spectrum, respectively, of the respective illuminating devices 621 to 624, respectively. These determining devices 631, 641, 651 and 661 or the color control devices 632, 642, 652 and 662, respectively, can in turn be embodied as separate functional units and can be assigned to the respective illuminating devices 621 to 624 or, as illustrated in FIG. 6, can be combined to form control units 630, 640, 650 and 660. A illuminating device 621 to 624 can then for example in each case be controlled by the respective assigned control unit 630, 640, 650, 660, which in each case communicates with the corresponding display units 611 to 614, to which the respective illuminating device 621 to 624 is assigned or between the transition area of which the respective illuminating device 621 to 624 extends, respectively.

Returning to FIG. 1, the mentioned color control device 142, which, e.g. together with the at least one determining device 141, can form a control unit 140, can control each of the light emitting elements 131 to 136 of the illuminating device 130 individually, i.e. separately and independently from the other lighting components, wherein, if applicable, a control in groups can also be provided. The color and/or the color spectrum of the light, which is emitted by the respective light emitting element 131 to 136, is thereby determined by means of the proposed method of operating the display device 100. The color control device 142 thereby considers color information, of which the colors of the image displays on the display units 110 and 120 are considered.

More specifically, color information, which is determined from image blocks 111 and 121, is considered for controlling a respective light emitting element 131. These image blocks 111 and 121 extend on the border areas of the display surfaces of the display units 110 and 120 and border the respective light emitting element 131, see FIG. 1. Separate or individual image blocks, respectively, on the adjacent border of the display units 110 and 120 can hereby be assigned to each light emitting element 131 to 136, wherein the subdivision of the border areas of the display units 110 and 120 bordering the illuminating device 130 into individual image blocks 111 to 116 as well as 121 to 126 can correspond to the subdivision of the illuminating device 130 into individual light emitting elements 131 to 136, as it is shown in FIG. 1. In the alternative, the image blocks 111 to 116 as well as 121 to 126, however, could also have another classification structure, for example could be slightly spaced apart from one another or could slightly overlap one another in pairs. Only a common image block could furthermore also in each case be assigned for example to two light emitting elements 131 to 136, such as, e.g. the light emitting elements 132 and 133, at each display unit 110 and 120. If applicable, only a single image block could also be provided here along every border of the display surfaces of every display unit 110 and 120 bordering to the illuminating device 130, or, e.g., the entire display surface of each display unit 110 and 120 could form the image block, which is to be evaluated. The subdivision shown in FIG. 1, however, allows for a better color adaptation of the light of the illuminating device 130 to the colors of the image displays of the display units 110 and 120 at the borders bordering the illuminating device 130.

In a first method step 1—e.g. as illustrated in FIG. 1—a first color information is determined from a respective image block 111 of a first one of the at least two display units 110 and 120 bordering the transition area, and a second color information is determined from a respective image block 121 of a second one of the at least two display units 110 and 120 bordering the transition area by means of the mentioned at least one determining device 141 for a corresponding control of an exemplary light emitting element 131 of the illuminating device 130. For determining the color information, a color information (e.g. emitted light/light spectrum) emitted by the respective image block 111 or 121, respectively, of the respective display unit 110 or 120, respectively, can be captured by means of optical waveguides 337 or can be coupled into the latter, respectively, and can be transmitted to the at least one determining device 141. In a second method step 2, at least one color signal is then formed as a function of the mentioned first and second color information determined by the determining device 141. The mentioned color control device 142 then uses this at least one color signal in a third method step 3, in order to control the light emitting element 131 or the illuminating device 130, respectively, as a function of this at least one color signal. As a function of the determined color information, a light, the color and/or color spectrum of which is determined by the at least one color signal, is then emitted by the light emitting element 131 or by the illuminating device 130, respectively.

As shown in FIG. 4, the proposed method can be carried out in different ways. According to FIG. 4a , for example, the at least one determining device 441 can be used to determine the color information for a pair or a plurality of image blocks 411 and 421 of the two separate display units 410 and 420. In the first method step 1, the color information signals, which originate from the different image blocks 411, 412 and which can be coupled into optical waveguides 337, e.g. and can be transmitted by the latter to the determining unit 441, are transmitted to the determining unit 441 one after the other. This can be obtained for example by means of a switching function in the determining unit 441. By means of this switching function, a first color information of an image block 411 of the first display unit 410 can be determined first, for example, and can be temporarily stored, if applicable. A second color information, e.g., of an image block 412 of the second display unit 420 can then be determined and temporarily stored, if applicable.

The determining unit 441 then transfers these two pieces of determined color information to the color control device 442 in the second method step. From the two pieces of color information, a color signal or mixed color signal, respectively, is then derived or mixed together, respectively. This mixed color signal can for example be derived by means of a calculation rule (e.g. as arithmetic means, etc.) or with the help of at least one color table from the determined color information, for example in the manner as already described. In the third method step 3, the color signal is then used by the color control device 442 to control the illuminating device 430, which then converts the mixed color signal into a light, the coloring of which corresponds to this color or mixed color signal, respectively.

FIG. 4b shows a further exemplary course of the proposed method, in the case of which the color information from the image blocks 411 and 421 of the display units 410 and 420 can be determined in a temporally parallel or approximately temporally parallel manner, respectively. For this purpose, provision is made for separate determining units 443 and 114, which are assigned for example—as illustrated in FIG. 4b —to the separate display units 410 and 420 as respective independent determining units 443 and 444. In the first method step 1, a first determining unit 443, for example, which is assigned to the first display unit 410, determines a first color information of an image block 411 of the first display unit 410. Temporally parallel thereto, a second determining unit 444, which is assigned to the second display unit 420, determines a second color information of an image block 412 of the second display unit 420. A transmission of the color information signals to the determining units 443, 444 can thereby take place by means of optical waveguides 337, for example.

The color information determined by the determining units 443 and 444 is then in turn transmitted to the color control device 442 in the second method step 2, which, in turn, can take place in a temporally parallel manner, if applicable. Analogous to the alternative of FIG. 4a , the color control device then forms the color signal or mixed color signal, respectively—e.g. by means of calculation ride or by means of at least one color table. In the third method step 3, the color control device 442 transmits this mixed color signal to the illuminating device 430 for the corresponding control and is converted accordingly by the illuminating device 430.

FIG. 4c shows a further alternative of the course of the method for operating the display device 100 in an exemplary and schematic manner. A mixing process is hereby physically carried out on the level of the illuminating device 430. For this purpose, the corresponding color information is first determined in the first method step 1 by the determining units 443 and 444 from the image blocks 411 and 421 assigned thereto of the respective display units 410 and 420. This color information is then converted into corresponding color signals in the second method step 2. In the third method step 3, the color control device 442 then transmits these color signals to separate subgroups or separate light emitting elements 431 and 432, respectively, of the illuminating device 430, so that the color signal, which was obtained, e.g., from the color information of the image block 411 of the first display unit 410, is converted by the one light emitting element 431, while the other light emitting element 432 converts the color signal, which was determined from the color information of the image block 421 of the second display unit 420. 

We claim:
 1. A display device comprising: at least one display unit; an illuminating device; at least one determining device for determining a color information from an image block of the at least one display unit, a color control device for controlling the color and/or the color spectrum of a light emitted by the illuminating device as a function of the color information, and a light detection device for detecting the light emitted by the at least one display unit, wherein the light detection device comprises a limited observation area which detects only one image portion of the display unit and is directed to the image block of the at least one display unit, wherein the light detection device is connected to the determining device, and the mentioned determining device is embodied to determine the color information from the light received from the light detection device, wherein the light detection device is combined with the illuminating device to form a pre-mounted assembly, which assembly can be attached to the at least one display unit and has mounting and/or positioning means, which are adapted in shape to a border section of the display unit, for mounting and/or positioning on the display unit.
 2. The display device according to claim 1, wherein the pre-mounted assembly has connecting means at its end sections so that several assemblies can be arranged one behind the other and/or next to one another in a row and connectable to one another, the connecting means preferably being provided with contacts for at least the power supply and/or for drive signals and/or a frame can be formed in a plane parallel to the display area of the display unit from interconnected assemblies.
 3. The display device according to claim 1, wherein a main axis of the limited observation area is directed onto the image block obliquely glancing at an acute angle from a border of the display unit.
 4. The display unit according to claim 1, wherein the light detection device has at least one optical waveguide for catching the light emitted by the light block and/or for transferring the caught light to the determining device, wherein the mentioned optical waveguide comprises a bundle of optical fibers.
 5. The display device according to claim 4, wherein the optical waveguide comprises an end section, which is directed to the image block, wherein the end section has coupling means for coupling in light from a limited observation area, wherein the mentioned coupling means preferably comprise a polished optical waveguide front side and/or a capture lens and/or a capture reflector.
 6. The display device according to claim 1, wherein, for transmitting the respective color information of the respective image blocks of the at least one display units to the at least one determining device provision is made for optical waveguides. 